*{
    padding: 0px;
    margin: 0 auto;
}
body{
    background: url(../images/1.png) no-repeat center center fixed;
    background-size: cover;
}
.back{
    background:  rgba(0,0,0,0.5);
    width:414px;
    height: 599px;
    margin: 30px auto;
    text-align: center;
}
.tu{
    border-radius: 50%;
    margin-top:97px ;
    margin-bottom:40px ;
}
ul{
    list-style: none;
}
li{
    margin-bottom: 21px;
}
.kuang{
    background: rgba(255, 255, 255,0.2);
    width: 300px;
    height: 52px;
    padding-left:46px ;
    border-radius: 4px;
    font-size: 16px;
    color: white;
    border:0.5px solid white;
}
input:focus{
    color: white;
    background: rgba(255, 255, 255,0.4);
}
.zi{
    width: 137px;
    height: 45px;
    background:rgb(0, 176, 220) ;
    border-radius: 6px;
    border:0;
    color:white;
}